OK, so I have been trying to get google voice setup in a nice way to work on my Tattoo and once I completely figure out what the hell I did I'll be sure to post a full walkthrough.

I tried like hell to get the apk file from anywhere online. Google would not provide the file so I decided to turn to the only other android device I had: the SDK emulator on my Mac.

The avd I was using was modified to be able to download content from the "normal" marketplace. I downloaded and installed the Google Voice app and started to wonder if I could open the userdata.img file. luckily, I didn't have to.

plz tell me how to install this application manually on my htc tattoo?

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The easiest way is to actually download it directly onto your phone by opening this page up in Browser and let Android do the legwork. You have to make sure to check off Settings->Applications->Unknown Sources in the phone first though.

That's the easiest way.The other way is by installing the SDK and using the adb application with the phone connected: